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ADELPHI (1)

AMPERE-Derived Electrodynamic Properties of the High-latitude Ionosphere

Model Description

The Adelphi code calculates storm-time high-latitude electrodynamics including 2D map of the electric potential, electric field, ionospheric currents, Joule heating, precipitating particle energy flux in addition to derived quantities such as the cross polar cap voltage and the auroral electrojet (AE) index (see https://doi.org/10.1029/2020SW002677) by estimating Hall and Pedersen conductances according to a correlation study between field aligned currents (FACs) measured by Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE) (see https://doi.org/10.1029/2020JA028008).

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Model Inputs Description

Ampere (next) data files labeled as for instance yyyymmdd.0000.86400.120.north.grd.ncdf which corresponds to AMPERE measurements during a 24 hr period on yyyy/mm/dd in the northern hemisphere. A text file yyyy0000DayList.txt accompanies these AMPERE files in which the first line instructs the number of days of the year(s) that need to be read and the next lines each are the dates in yyyymmdd format of that year where the AMPERE data files will be read in and the code will use them for calculation.

Model Outputs Description

Adelphi writes 1D and 2D outputs to file. The 2D outputs correspond to 1 hr magnetic local time resolution and magnetic latitude in 1 degree resolution from 40 to 89 degrees. The output parameters in the 2D case are Pedersen and Hall conductances used in the model, electric potential, perpendicular E field components in east-west and north-south directions, perpendicular current intensity components in east-west and north-south directions, precipitating particle energy flux, Joule heating, and the field-aligned current density measured by AMPERE and calculated by Adelphi (for consistency purposes).

The 1D output corresponds to cross polar cap potential, hemispherically integrated precipitating particle energy flux and Joule heating, modeled aurora electrojet index, hemispherically integrated field-aligned current measured by AMPERE and calculated by the model (for consistency check).

Outputs correspond to 2 minute resolution in time for a 24-hour period for both northern and southern hemispheres.

Model Caveats

The model focuses on high-latitude electrodynamics where a detailed 2D map of conductances is combined with AMPERE measured field-aligned current densities to solve the continuity equation (under steady state conditions). Whereas AMPERE has provided the means to measure field aligned currents at all northern and southern hemisphere locations above 40° magnetic latitude, in the model a corresponding global map of conductance is produced following https://doi.org/10.1029/2020JA028008 which presents correlations between conductance and AMPERE measured field-aligned currents derived at one geographical location (using PFISR data)

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Curator: Chiu Wiegand | NASA Official: Dr. Masha Kuznetsova | Privacy and Security Notices | Accessibility | CCMC Data Collection Consent Agreement